21,4 Witt: Cement and Concrete 367 
TABLE 1.—The effect on tensile strength—Continued. 
Cement I. Cement II. 
Salt and normal- 
ity of solution. 180 180 
7 days. |28 days. days. l year. |5 years.|7 days. |28 days. days. 1 year. |5 years. 
Copper _ sul- 
phate: 
006i. 252 830 851 852 347 250 845 361 820 | 844 
iy || eater 205 829 858 880 826 219 295 308 321 336 
0: BO sca 108 866 495 413 406 191 340 461 448 393 
ES | t Saeen 56 280 413 449 358 156 362 394 363 850 
Sodium bicar- 
bonate: 
1g ena 282 839 365 320 828 242 262 276 257 335 
as || emenere ere 191 287 848 343 834 270 287 310 854 318 
20} earnest 201 815 406 398 805 224 811 370 357 339 
LOO. ada. 254 335 415 485 330 251 328 323 314 265 
Potassium bi- 
carbonate: 
Occ 234 331 357 814 838 226 249 288 235 374 
Pee a | Pecoraro 197 270 330 320 386 243 321 358 339 347 
0. BO see coe 253 869 421 364 827 243 803 394 355 | 875 
pO, caer or 272 343} 3884 366 308 234 308 - 846 351 398 
Cement III. Cement IV. 
|Salt and normal- 
ity of solution. 7 180 180 
days. |28 days. days. 1 year. |5 years.| 7 days. saere dave. 1 year. |5 years. 
Water 321 389 418 459 353 218 297 373 877 351 
Sodium chlo- 
ride: 
0. 05. 268 830 343 330 320 182 264 823 325 | 831 
O10. 208 290 355 317 321 153 218 313 331 297 
2 | Eee 233 808 349 347 321 149 290 324 819 | 3806 
LO iccad. 803 878 378 334 270 197 236 324 348 308 
Zine chloride: 
Obes 265 345 372 821 328 196 265 356 327 355 
O.1Geicc 278 821 420 408 876 | 156 249 315 386 284 
US | Seana are 293 397 428 427 393 231 294 417 388 386 
sees F  Seranieic 391 368 365 341 295 197 307 486 427 309 
Copper chlo- 
ride: 
0 GB ses. ick 216 390 352 322 317 170 203 365 329} 348 
OS ce 230 319 409 399 845 141 230 321 339 | 344 
| Sener 249 348 450 470 875 99 226 367 408 290 
p A: Saree 247 403 453 425 317 185 284 895 438 | 325 
Sodium ni- 
trate: 
DW esc ce 271 352 854 826; 305 166 232 342 819 | 295 
5 Peeing 213 339 877 375 377 130 176 807 829 | 320 
De ekas aan 194 302 340 833 {> 250 107 168 291 303 302 
Pe eee 179 299 874 825 294 132 232 336 | 333! 290 
